private IEnumerable <Transaction> GenerateCrossChainIndexingTransaction(Address from, long refBlockNumber,
Hash previousBlockHash)
{
var generatedTransactions = new List <Transaction>();
var previousBlockPrefix = previousBlockHash.Value.Take(4).ToArray();
// should return the same data already filled in block header.
var filledCrossChainBlockData =
_crossChainIndexingDataService.GetUsedCrossChainBlockDataForLastMining(previousBlockHash, refBlockNumber);
// filledCrossChainBlockData == null means no cross chain data filled in this block.
if (filledCrossChainBlockData != null)
{
generatedTransactions.Add(GenerateNotSignedTransaction(from, CrossChainConstants.CrossChainIndexingMethodName, refBlockNumber,
previousBlockPrefix, filledCrossChainBlockData));
}
Logger.LogTrace($"{generatedTransactions.Count} Cross chain transaction generated.");
return(generatedTransactions);
}